n, m = map(int, input().split())
s = input()


used = [False] * ((n + m) * 2)

posA = []
for i in range((n + m) * 2):
    if s[i] == "A":
        posA.append(i)

posA = posA[::-1]
for i in range((n + m) * 2):
    if s[i] == "C":
        j = posA.pop()
        if j < i:
            used[i] = True
            used[j] = True
        else:
            print("No")
            exit()

t = []
for i in range((n + m) * 2):
    if not used[i]:
        t.append(s[i])

stack = []
for char in t:
    if char == "A" and stack and stack[-1] == "W":
        stack.pop()
    else:
        stack.append(char)
if stack:
    print("No")
else:
    print("Yes")